The light(s) out on the fender are a "public display" that other drivers can see.

Hmm,
that is a new angle,
I had not considered.

What would be my reaction if
another driver in the same make and model vehicle passed me on the Interstate
but as he went by i could see two lights on top his fender indicating from both that he was driving inside the "island of best fuel economy"
whereas my lights showed my vehicle was not?

Aero mods, gear ratio changes, engine mods, low rolling resistance tires, could all honestly cause this.

Obviously, it could be dishonestly "hacked"